Add Stdio.readByteSync and Stdio.readLineSync.

sdk/lib/_internal/lib/io_patch.dart

Index: sdk/lib/_internal/lib/io_patch.dart
diff --git a/sdk/lib/_internal/lib/io_patch.dart b/sdk/lib/_internal/lib/io_patch.dart
index 9e573409ac8357e2fa6775dcc377ee53a856c6f0..b152e1eb308d1eaf8acb96ab8f237f5813a995b3 100644
--- a/sdk/lib/_internal/lib/io_patch.dart
+++ b/sdk/lib/_internal/lib/io_patch.dart
@@ -289,7 +289,7 @@ patch class _SecureFilter {
 }
 
 patch class _StdIOUtils {
-  patch static Stream<List<int>> _getStdioInputStream() {
+  patch static Stdio _getStdioInputStream() {
     throw new UnsupportedError("StdIOUtils._getStdioInputStream");
   }
   patch static IOSink _getStdioOutputStream(int fd) {
@@ -320,3 +320,9 @@ patch class _Filter {
     throw new UnsupportedError("newZLibInflateFilter");
   }
 }
+
+patch class Stdin {
+  patch int readByteSync() {
+    throw new UnsupportedError("Stdin.readByteSync");
+  }
+}